Use --pull-policy if-not-present when running pack build
#373
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This probably means consumers should run a |
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CI won't have any cached images (unless using the paid circle ci docker layer caching feature, which we'd never want to use with pack), so will always pull the latest image in the first test run in a job. This PR just means subsequent tests in that job don't needlessly pull again after that. |
libcnb-test/src/pack.rs
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| // Adjust pull-policy to prevent redundant image-pulling, which slows CI and risks hitting registry rate limits. | ||
| String::from("--pull-policy"), | ||
| String::from("if-not-present"), |
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Nit-ish: PackBuildCommand was meant to abstract away the building of the pack command from out actual logic which flags should be passed, etc.
I would love to see a pull_policy field on PackBuildCommand that is of type PullPolicy and the "logic" (even though its a static value at this point) moved to the call-site to keep the separation of concerns.
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Marking this as "breaking change". Although unlikely, if users rely on automatic pulling to keep up-to-date, this will break them. I don't think this should be a huge concern for us at this point though. |
Since it: 1. Saves ~2 seconds per integration test re-pulling an image that's already up to date. 2. Helps prevent hitting Docker Hub or ECR rate limits from duplicate (and redundant) image pulling (that counts agains the rate limit even when it's a no-op). Longer term, if Pack CLI supports a periodic pulling mode (buildpacks/pack#1368), we can switch to that, however for now this is the lesser of two evils - and in most cases Pack usage outside of `libcnb-test` will ensure that newer builder images are pulled from time to time. Fixes #306.
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Thanks!
Since it:
Longer term, if Pack CLI supports a periodic pulling mode (buildpacks/pack#1368), we can switch to that, however for now this is the lesser of two evils - and in most cases Pack usage outside of
libcnb-testwill ensure that newer builder images are pulled from time to time.See #306 for more details.
See also:
https://buildpacks.io/docs/tools/pack/cli/pack_config_pull-policy/
Fixes #306.
GUS-W-10799284.